Motor, rotor punching sheet and simulation method thereof

Abstract

The invention belongs to the technical field of motor rotors, and provides a motor, a rotor punching sheet and a simulation method thereof, and the method comprises the steps: constructing a rotor punching sheet model; a mark groove is formed in the rotor punching sheet model; and / or a special-shaped groove is formed in the rotor punching sheet model; and performing a simulation test on the rotor punching sheet model provided with the mark groove and / or the special-shaped groove until the yield strength of the corresponding position of the mark groove meets the target range, and / or until the yield strength of the corresponding position of the special-shaped groove and the torque pulse signal of the rotor punching sheet model meet the target range. According to the simulation method, the mark groove and the special-shaped groove are formed in the rotor punching sheet, on one hand, the target position of the mark groove in the rotor punching sheet is found according to the yield strength, it is avoided that the mark groove is formed in the inner surface of the rotor punching sheet, and the reliability of the rotor punching sheet is improved; on the other hand, the special-shaped grooves are limited according to the yield strength and the torque pulse signal, the reliability of the rotor punching sheet is further improved, and meanwhile, the NVH performance of the rotor punching sheet is optimized.

Description

Technical Field

[0001] The invention belongs to the technical field of motor rotors, and in particular relates to a motor, a rotor punching sheet and a simulation method thereof. Background Art

[0002] Nowadays, the development of new energy vehicles is in full swing, and the technical level of its sub-modules is also developing by leaps and bounds. The extremely important electric drive system among the three electrics has higher requirements, which can be roughly summarized as high speed, high efficiency and low noise.

[0003] High speed requires high reliability and the mechanical strength of the rotor must be guaranteed. Currently, most research on mechanical strength focuses on the upper and lower magnetic bridges. The yield strength risk assessment at the marking groove is relatively small. By default, the marking groove is set at the inner diameter of the rotor, such as Figure 1 As shown, in order to reduce costs, the shaft and the rotor core are now pure interference fit, which requires a higher interference amount. At this time, if the marking groove is placed in Figure 1 The inner diameter of the rotor shown in the figure will be at risk of tearing after being subjected to harsh working conditions such as high speed and high temperature. In addition, low noise corresponds to comfort. Currently, most of the means of optimizing noise are grooving the stator and rotor surfaces, optimizing the pole arc coefficient, and optimizing the rotor staggered pole form and angle, etc. These methods are relatively traditional and fixed, and do not conform to the diversification of comfort optimization means. Summary of the invention

[0004] In order to solve the problems in the background technology, the present invention proposes a motor, a rotor punching sheet and a simulation method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A motor rotor punching simulation method comprises the following steps:

[0007] Construct rotor punching model;

[0008] Opening a marking groove on the rotor punching model;

[0009] and / or, forming a special-shaped groove on the rotor punching mold;

[0010] A simulation test is performed on a rotor punching model with marking grooves and / or special-shaped grooves until the yield strength at the corresponding position of the marking groove meets the target range, and / or until the yield strength at the corresponding position of the special-shaped groove and the torque pulse signal of the rotor punching model meet the target range.

[0011] Preferably, constructing a rotor punching model comprises the following steps:

[0012] Constructing a plurality of sector-shaped punching sheets, wherein the sector-shaped punching sheets are sequentially connected along the circumferential direction to form the circular rotor punching sheet model;

[0013] n offset holes are opened on the rotor punching model; the offset holes are arranged along the circumferential direction of the center of the rotor punching model; the angle between the kth offset hole and the k+2th offset hole is 90°, n≥k≥1.

[0014] Preferably, the marking groove is formed on the rotor punching model, comprising the following steps:

[0015] A ray is drawn from the center of the offset hole to the d-axis of the sector-shaped punching piece, wherein the d-axis is located on the symmetry center line of the sector-shaped punching piece;

[0016] Setting the angle between the ray and the edge of the fan-shaped punching sheet to be a first angle, wherein the first angle ranges from 30° to 65°;

[0017] Any point on the ray is selected as the center of the marking groove, and the radius of the marking groove is 1-2 mm.

[0018] Preferably, forming a special-shaped groove on the rotor punching model comprises the following steps:

[0019] The special-shaped groove is opened along the center line of the fan-shaped punching piece.

[0020] Preferably, a simulation test is performed on a rotor punching model with a marking groove until the yield strength at a position corresponding to the marking groove meets a target range, comprising the following steps:

[0021] Open the marking slot M i The yield strength test of the rotor punching model is carried out to obtain the yield strength Y i , i≥1;

[0022] If the yield strength Y i Less than 385MPa, the marking groove M i Satisfy the simulation test, otherwise reopen the marker slot M i+1 Conduct a test.

[0023] Preferably, a simulation test is performed on a rotor punching model with a special-shaped slot until the yield strength at a position corresponding to the special-shaped slot and the torque pulse signal of the rotor punching model meet a target range, comprising the following steps:

[0024] T-shaped groove j The rotor punching model is subjected to yield strength test and torque test to obtain the yield strength Y j and torque Z j , j ≥ 1;

[0025] If the yield strength Y j Less than 385MPa, and torque Z j In the target torque range, the special-shaped slot T jIf the simulation test is satisfied, otherwise a new special-shaped slot T will be opened j+1 The test was conducted; the target torque range was the torque of the rotor punching model without special-shaped slots plus ±0.5 N·m.

[0026] A motor rotor punching sheet, obtained according to the above motor rotor punching sheet simulation method, comprises a plurality of sector-shaped punching sheets connected in sequence along the circumferential direction, wherein the sector-shaped punching sheets are in a sector shape;

[0027] The edges of both sides of the fan-shaped punching sheet are provided with offset holes;

[0028] A marking groove is provided on the surface of the fan-shaped punching sheet, and the marking groove is located on one side of the dislocation hole;

[0029] Symmetrical magnetic pole splitting grooves are provided on the surface of the sector-shaped punching sheet;

[0030] A special-shaped groove is provided on the surface of the sector-shaped punching sheet. The special-shaped groove is located on the symmetry center line of the sector-shaped punching sheet and between the magnetic pole split grooves.

[0031] Preferably, the special-shaped groove is a special-shaped trapezoidal groove, and the profile of the special-shaped trapezoidal groove includes:

[0032] first bottom edge;

[0033] A first side edge connected to one end of the first bottom edge;

[0034] A second side edge is connected to the other end of the first bottom edge and has a length shorter than the first side edge;

[0035] The first side edge and the second side edge are symmetrically arranged with the center line of the first bottom edge as the center;

[0036] The second bottom edge is provided with two sections, the first section is connected to the end of the second side away from the first bottom edge with the center line of the first bottom edge as the starting point; the second section is connected to the starting point of the first section with the end of the first side away from the first bottom edge as the starting point;

[0037] The horizontal projection length of the second bottom side is greater than the length of the first bottom side;

[0038] With the center of the circle of the sector-shaped punching sheet as the center, the first bottom edge is located outside the center of the circle, and the second bottom edge is located outside the first bottom edge.

[0039] Preferably, in the second bottom edge, the angle between the first section and the center line of the first bottom edge is 85° to 95°;

[0040] The included angle between the second section and the center line of the first bottom edge is 0-90°.

[0041] A motor is provided with the motor rotor punching sheet mentioned above.

[0042] Beneficial effects of the present invention:

[0043] 1. The simulation method of the present invention provides a marking groove and a special-shaped groove on the rotor punching sheet. On the one hand, the target position of the marking groove on the rotor punching sheet is found according to the yield strength, so as to avoid setting the marking groove on the inner surface of the rotor punching sheet, thereby improving the reliability of the rotor punching sheet; on the other hand, the special-shaped groove is limited according to the yield strength and the torque pulse signal, thereby further improving the reliability of the rotor punching sheet and optimizing the NVH performance of the rotor punching sheet;

[0044] 2. The present invention provides a marking groove on one side of the staggered pole hole, and adjusts the position and size of the marking groove by optimizing the first angle and the radius of the marking groove, thereby solving the existing risks and meeting the yield strength requirements of the silicon steel sheet without affecting the motor performance and the function of the marking groove;

[0045] 3. The present invention adds a special-shaped trapezoidal groove, which is narrow at the bottom and wide at the top. The lower part is symmetrical on both sides of the center line. By finding the optimal angle between the two sides of the trapezoid, the mechanical stress at the magnetic bridge is lower than the yield stress of the silicon steel sheet, thereby reducing the risk of rotor punching breakage, thereby improving the mechanical strength of the motor to meet the reliability of high speed; the upper part is asymmetric and special-shaped because the angles a3 and a4 are not equal. This shape can optimize noise and provide a new idea for reducing torque pulsation.

[0046] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0048] Figure 1 A schematic diagram of the structure of an existing motor rotor punching sheet is shown;

[0049] Figure 2 A flow chart of a motor rotor punching simulation method of the present invention is shown;

[0050] Figure 3a A schematic structural diagram of a motor rotor punching sheet of the present invention is shown;

[0051] Figure 3bA schematic diagram showing the structure of the fan-shaped punching sheet of the present invention is shown;

[0052] Figure 4 A schematic diagram of the profile of the special-shaped groove of the present invention is shown;

[0053] Figure 5 The figure shows the simulation result of the mechanical strength of the marker slot of the existing scheme;

[0054] Figure 6 The simulation result diagram of the mechanical strength of the marker slot after the optimization is shown;

[0055] Figure 7 A diagram showing simulation results of the mechanical strength of an unoptimized trapezoidal structure;

[0056] Figure 8 The simulation results of the mechanical strength of the optimized trapezoidal structure are shown;

[0057] Fig. 9 A torque curve comparison diagram of the trapezoidal profile of the present invention and the non-profile of the existing solution is shown;

[0058] Fig.10 A torque harmonic comparison diagram of the trapezoidal profile of the present invention and the non-profile of the existing solution is shown.

[0059] In the figure: 1, fan-shaped punching sheet; 101, magnetic pole splitting groove; 102, first bottom edge; 103, first side edge; 104, second side edge; 105, second bottom edge; 2, offset hole. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] A motor rotor punching simulation method, such as Figure 2 As shown, the following steps are included:

[0062] S1: Build the rotor punching model.

[0063] S2: Opening a marking groove on the rotor punching model, and / or opening a special-shaped groove on the rotor punching model.

[0064] S3: Perform simulation test on the rotor punching model with marking grooves and / or special-shaped grooves until the yield strength at the position corresponding to the marking groove meets the target range, and / or until the yield strength at the position corresponding to the special-shaped groove and the torque pulse signal of the rotor punching model meet the target range.

[0065] It should be noted that in S1-S3, the position of the marking slot can be adjusted multiple times during the simulation process until the yield strength of the current material is met, while not affecting the motor performance and the identification function of the marking slot itself. In addition, the special-shaped slot can reduce the yield stress at the magnetic bridge during multiple simulations, reduce the risk of fracture of the rotor punching, thereby improving the mechanical strength of the motor to meet the reliability of high speed; at the same time, the special-shaped slot can also optimize the NVH (noise, vibration and harshness) performance of the motor.

[0066] Furthermore, a rotor punching model is constructed in S1, including the following steps:

[0067] S101: construct a plurality of sector-shaped punching sheets 1, wherein the sector-shaped punching sheets 1 are sequentially connected along the circumferential direction to form a circular rotor punching sheet model.

[0068] S102: n offset holes 2 are opened on the rotor punching model; the n offset holes 2 are arranged along the circumferential direction of the center of the rotor punching model; the angle between the kth offset hole 2 and the k+2th offset hole 2 is 90°, n≥k≥1.

[0069] It should be noted that if Figure 3a As shown, it is half of a complete rotor punching model, and the angle between adjacent offset holes 2 can be 46.85° or 43.15°, but both satisfy the relationship that the angle between the i-th offset hole 2 and the i+2-th offset hole 2 is 90°.

[0070] Furthermore, in S2, a marking groove is formed on the rotor punching model, comprising the following steps:

[0071] S201a: Draw a ray toward the d-axis of the fan-shaped punch 1 from the center of the dislocated hole 2, and the d-axis is located on the symmetry center line of the fan-shaped punch 1. S202a: Set the angle between the ray and the edge line of the fan-shaped punch 1 to be the first angle, which ranges from 30° to 65°. S203a: Take any point on the ray as the center of the marking groove, and the radius of the marking groove is 1-2 mm.

[0072] Furthermore, in S2, a special-shaped groove is formed on the rotor punching model, comprising the following steps:

[0073] S201b: Opening the special-shaped groove along the center line of the sector-shaped punching piece 1.

[0074] It should be noted that in order to increase the reliability and comfort of the motor and meet the high speed and high power operation, the synchronous motor rotor punching topology design is carried out. In the product manufacturing process, the marking groove on the rotor is needed to identify the misalignment angle. The left side of the marking groove is the positive misalignment angle or the negative misalignment angle, and the right side is the opposite angle.

[0075] It should be further explained that the centers of some of the misaligned holes 2 are located on the edge of the sector-shaped punching piece 1, and the centers of the remaining misaligned holes 2 are slightly deviated from the edge of the sector-shaped punching piece 1, and the angle of deviation is the misaligned angle.

[0076] Further, in S3, a simulation test is performed on the rotor punching model with the marking grooves until the yield strength at the position corresponding to the marking grooves meets the target range, including the following steps:

[0077] S301a: Opening a marking groove M i The yield strength test of the rotor punching model is carried out to obtain the yield strength Y i , i≥1. S302a: If the yield strength Y i Less than 385MPa, the marking groove M i Satisfy the simulation test, otherwise reopen the marker slot M i+1 Conduct a test.

[0078] For example, in the manufacturing process of rotor punching of a certain type of motor, the first marking slot M1 is first opened according to the design requirements, and the yield strength test is performed to obtain the yield strength Y1. After analysis, Y1 is less than 385MPa, so it is judged that M1 meets the simulation test requirements and there is no need to open a new marking slot.

[0079] For example, in the manufacture of another type of generator rotor punching sheet, the yield strength test result of the first marked slot M1 shows that Y1 is less than or equal to 385MPa, indicating that M1 does not meet the requirements. Therefore, according to step S302a, the second marked slot M2 is reopened and tested to obtain Y2. This time, Y2 is less than 385MPa, so M2 meets the simulation test requirements.

[0080] Further, in S3, a simulation test is performed on the rotor punching model with the special-shaped slots until the yield strength at the corresponding position of the special-shaped slots and the torque pulse signal of the rotor punching model meet the target range, including the following steps:

[0081] S301b: Open special-shaped groove T j The rotor punching model is subjected to yield strength test and torque test to obtain the yield strength Y j and torque Z j , j ≥ 1. S302b: If the yield strength Y j Less than 385MPa, and torque Zj In the target torque range, the special-shaped slot T j If the simulation test is satisfied, otherwise a new special-shaped slot T will be opened j+1 The test was conducted; the target torque range was the torque of the rotor punching model without special-shaped slots plus ±0.5 N·m.

[0082] It should be noted that in S3, the flexibility and effectiveness of the simulation method for the positions of the marking grooves and the special-shaped grooves in practical applications can ensure that the performance of the rotor punching meets the design requirements through continuous testing and adjustment.

[0083] like Figure 3b As shown, a motor rotor punching sheet can be Figure 2 The motor rotor punching topology simulation method in the embodiment of the present invention is obtained, comprising a plurality of fan-shaped punchings 1 connected in sequence along the circumferential direction, which can constitute Figure 3a The rotor punching sheet in the embodiment of the present invention is in the shape of a sector. Specifically, the sector punching sheet 1 is provided with offset holes 2 on both side edges. In addition, a marking groove is provided on the surface of the sector punching sheet 1, which is marked as M and is located on one side of the offset hole 2. A symmetrical magnetic pole splitting groove 101 and a special-shaped groove are provided on the surface of the sector punching sheet 1, which is marked as Y and is located on the symmetry center line of the sector punching sheet 1 and between the magnetic pole splitting grooves 101.

[0084] Furthermore, if Figure 4 As shown, the special-shaped groove is a special-shaped trapezoidal groove, and the outline of the special-shaped trapezoidal groove includes a first bottom edge 102 , a first side edge 103 , a second side edge 104 and a second bottom edge 105 .

[0085] The first side 103 is connected to one end of the first base 102, and the second side 104 is connected to the other end of the first base 102, and its length is shorter than the first side 103; the first side 103 and the second side 104 are symmetrically arranged with the center line of the first base 102 as the center; the second base 105 is provided with two sections, the first section is connected to the end of the second side 104 away from the first base 102 with the center line of the first base 102 as the starting point; the second section is connected to the starting point of the first section with the end of the first side 103 away from the first base 102 as the starting point; in addition, the horizontal projection length of the second base 105 is greater than the length of the first base 102, and with the center of the circle of the fan-shaped punch 1 as the center, the first base 102 is located outside the center of the circle, and the second base 105 is located outside the first base 102. Meanwhile, in the second bottom edge 105, the angle between the first section and the center line of the first bottom edge 102 is 85° to 95°, preferably 90°; the angle between the second section and the center line of the first bottom edge 102 is 0-90°.

[0086] It should be noted that in Figure 3bIn order to reduce the yield strength of the rotor, the marking groove is placed at the lower left corner of the offset hole 2. This position will not cause local magnetic flux saturation and will not affect the torque. Through optimization, it was found that the first angle a1 is optimal between 30° and 65°, and r1 (radius of the marking groove) = 1-2mm is optimal. After simulation, the tearing risk of the marking groove is resolved, and the yield strength is reduced by about 50MPa, which meets the use requirements of silicon steel sheets and increases product reliability; the special-shaped trapezoidal groove has two main functions, one is to optimize the mechanical strength of the rotor, and the other is to optimize NVH. Because the force on the lower magnetic bridge is due to the gravity of the magnetic steel transmitted to the magnetic bridge, the high speed causes the magnetic bridge to be the main force point, and therefore it is the main stress band area of ​​concern. The opening of the magnetic steel slot faces outward, and it is in the same direction as the magnetic bridge stress band, so the trapezoid is narrow at the bottom and wide at the top, and the angle a2 also has a certain regularity, which is generally 0.098-0.11 times the magnetic steel slot angle. Through simulation comparison, this type of structure can be optimized by 13MPa to meet the yield strength requirements of silicon steel sheets; the special shape of the trapezoid is mainly that a3 and a4 (90° in Figure 3) are not equal, and the center line is not used as the symmetry line. This kind of asymmetric structure can optimize the d-axis magnetic circuit and reduce harmonics. The 6th and 12th frequencies are both reduced by more than 25%, further reducing torque pulsation and solving NVH problems in low-speed areas.

[0087] In general, the present invention optimizes the position and size of the marking groove on the basis of conventional rotor punching sheets, greatly reduces the rotor yield strength without affecting the identification of the misaligned pole hole 2, the design is highly feasible and the product reliability is excellent; the trapezoidal angle is optimized for the lower magnetic bridge, and the mechanical strength of the magnetic bridge is significantly reduced without increasing the leakage magnetic field; by adopting an asymmetric special-shaped design for the trapezoidal slot, the torque pulsation harmonic amplitude can be greatly reduced, and the reduction is more than 25%, which effectively solves the NVH risk caused by low-speed torque pulsation.

[0088] like Figure 5 As shown, it is the simulation result of the mechanical strength of the marking groove of the existing scheme, and the yield strength at the marking groove position is 395.6MPa.

[0089] like Figure 6 As shown, it is the simulation result of the mechanical strength of the mark groove of the optimized scheme. The yield strength at the mark groove position is 345MPa, which is reduced by 50MPa, about 12%.

[0090] like Figure 7 As shown, it is the simulation result of the mechanical strength of the unoptimized trapezoidal structure, and the yield strength of the magnetic bridge is 379MPa.

[0091] like Figure 8 , which is the simulation result of the mechanical strength of the optimized trapezoidal structure, the yield strength of the magnetic bridge is 366MPa, which is reduced by 13MPa, about 3.3%.

[0092] like Fig. 9 As shown, it is a comparison diagram of the torque curves of the special-shaped groove of the present invention and the non-special-shaped one of the existing scheme, wherein curve A is the torque curve of the non-special-shaped one, and curve B is the torque curve corresponding to the special-shaped groove. By comparison, it can be seen that the torque pulsation of curve B is significantly reduced relative to curve B, which is beneficial to optimizing the noise, vibration and acoustic roughness (NVH, full name Noise, Vibration, Harshness) performance.

[0093] like Fig.10 As shown, it is a torque harmonic comparison diagram of the special-shaped slot of the present invention and the non-special-shaped slot of the existing solution, wherein C represents the torque harmonic of the non-special-shaped slot, and D represents the torque harmonic corresponding to the special-shaped slot. By comparison, it can be seen that the torque amplitude decreases by 32% at the 6th frequency, and the torque decreases by 33% at the 12th frequency.

[0094] It should be noted that the motor rotor punchings in the above structure can be installed in a variety of motors, such as AC asynchronous motors, DC motors, synchronous motors, stepper motors, brushless DC motors, etc.

[0095] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A motor rotor punching simulation method, characterized in that: The following steps are involved: Construct rotor punching model; Opening a marking groove on the rotor punching model; and / or, forming a special-shaped groove on the rotor punching mold; A simulation test is performed on a rotor punching model with marking grooves and / or special-shaped grooves until the yield strength at the corresponding position of the marking groove meets the target range, and / or until the yield strength at the corresponding position of the special-shaped groove and the torque pulse signal of the rotor punching model meet the target range.

2. A motor rotor punching simulation method according to claim 1, characterized in that: Building a rotor lamination model includes the following steps: Constructing a plurality of sector-shaped punching sheets (1), wherein the sector-shaped punching sheets (1) are sequentially connected along the circumferential direction to form the circular rotor punching sheet model; N offset holes (2) are provided on a rotor punching model; the offset holes (2) are arranged along the circumferential direction of the center of the rotor punching model; the angle between the kth offset hole (2) and the k+2th offset hole (2) is 90°, and n≥k≥1.

3. A motor rotor punching simulation method according to claim 2, characterized in that: The marking groove is opened on the rotor punching model, including the following steps: A ray is drawn from the center of the offset hole (2) toward the d-axis of the sector-shaped punch (1) with the d-axis being located on the symmetry center line of the sector-shaped punch (1); Setting the angle between the ray and the edge of the fan-shaped punching sheet (1) as a first angle, wherein the first angle ranges from 30° to 65°; Any point on the ray is selected as the center of the marking groove, and the radius of the marking groove is 1-2 mm.

4. A motor rotor punching simulation method according to claim 2, characterized in that: The process of opening a special-shaped groove on a rotor punching model includes the following steps: The special-shaped groove is provided along the center line of the sector-shaped punching sheet (1).

5. The method for simulating a motor rotor punching according to claim 2, characterized in that: A simulation test is performed on a rotor punching model with a marking groove until the yield strength at a position corresponding to the marking groove meets a target range, including the following steps: Open the marking slot M i The yield strength test of the rotor punching model is carried out to obtain the yield strength Y i , i≥1; If the yield strength Y i Less than 385MPa, the marking groove M i Satisfy the simulation test, otherwise reopen the marker slot M i+1 Conduct a test.

6. A motor rotor punching simulation method according to claim 2, characterized in that: A simulation test is performed on a rotor punching model with a special-shaped slot until the yield strength at the corresponding position of the special-shaped slot and the torque pulse signal of the rotor punching model meet the target range, including the following steps: T-shaped groove j The rotor punching model is subjected to yield strength test and torque test to obtain the yield strength Y j and torque Z j , j ≥ 1; If the yield strength Y j Less than 385MPa, and torque Z j In the target torque range, the special-shaped slot T j If the simulation test is satisfied, otherwise a new special-shaped slot T will be opened j+1 The test was conducted; the target torque range was the torque of the rotor punching model without special-shaped slots plus ±0.5 N·m.

7. A motor rotor punching sheet, characterized in that: The motor rotor punching sheet simulation method according to any one of claims 1 to 6 comprises a plurality of sector punching sheets (1) connected in sequence along the circumferential direction, wherein the sector punching sheets (1) are sector-shaped; The two side edges of the sector-shaped punching sheet (1) are provided with offset holes (2); A marking groove is provided on the surface of the sector-shaped punching sheet (1), and the marking groove is located on one side of the offset hole (2); The surface of the sector-shaped punching sheet (1) is provided with symmetrical magnetic pole separation grooves (101); A special-shaped groove is provided on the surface of the sector-shaped punching sheet (1), and the special-shaped groove is located on the symmetry center line of the sector-shaped punching sheet (1) and between the magnetic pole splitting grooves (101).

8. The motor rotor punching sheet according to claim 7, characterized in that: The special-shaped groove is a special-shaped trapezoidal groove, and the profile of the special-shaped trapezoidal groove includes: a first bottom edge (102); A first side edge (103) connected to one end of the first bottom edge (102); A second side edge (104) connected to the other end of the first bottom edge (102) and having a length shorter than that of the first side edge (103); The first side edge (103) and the second side edge (104) are symmetrically arranged with the center line of the first bottom edge (102) as the center; The second bottom edge (105) is provided with two sections, the first section is connected to the end of the second side edge (104) away from the first bottom edge (102) with the center line of the first bottom edge (102) as the starting point; the second section is connected to the starting point of the first section with the end of the first side edge (103) away from the first bottom edge (102) as the starting point; The horizontal projection length of the second bottom side (105) is greater than the length of the first bottom side (102); With the center of the circle of the sector-shaped punching sheet (1) as the center, the first bottom edge (102) is located outside the center of the circle, and the second bottom edge (105) is located outside the first bottom edge (102).

9. The motor rotor punching sheet according to claim 8, characterized in that: In the second bottom edge (105), the angle between the first section and the center line of the first bottom edge (102) is 85° to 95°; The included angle between the second section and the center line of the first bottom edge (102) is 0-90°.

10. A motor, characterized in that: The motor rotor punching sheet according to any one of claims 7 to 9 is installed.

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